Light stick



FIG. 1 is a front, top perspective view of a light stick showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side view thereof, as seen from the left-hand side of FIG. 1;

FIG. 4 is a front view thereof;

FIG. 5 is a side view thereof, as seen from the right-hand side of FIG. 1;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a light stick, as shown and described. 